You can buy both regular insulin and NPH insulin over the counter in most states. The NPH insulin is the longer acting insulin (8-12 hours). It has both a steeper peak, and a shorter duration than lantus (no actual peak 12-24 hr duration). For NPH, you may have to switch to every 8 hour dosing or possible a modified schedule. The benefit of NPH is that it's not a depot insulin so you can adjust the schedule easier and also utilize faster dose changes. You can purchase it off www.adwdiabetes.com as well.